ElementsWhat is seaborgium?
Seaborgium is a radioactive element made in particle accelerators. It was the first element to be named after a person who was alive at the time.
What is seaborgium used for?
Research only.
Where the name comes from
In honour of the chemist Glenn Seaborg, who helped discover ten elements.
Key facts
- Symbol
- Sg
- Atomic number
- 106
- Atomic mass
- 269.128 u
- Family
- Transition metal
- Period
- 7
- Group
- 6
- Block
- d
- State at room temperature
- Solid
- Melting point
- not measured
- Boiling point
- not measured
- Density
- not measured
- Electrons per shell
- 2, 8, 18, 32, 32, 12, 2
- Electron configuration
- [Rn]7s2 5f14 6d4
- Common oxidation states
- 6, 5, 4, 3, 0
- Electronegativity (Pauling)
- no value
- First ionisation energy
- not measured
- Electron affinity
- no value
- Atomic radius (van der Waals)
- no value
- Discovered
- 1974
Place in the periodic table
Seaborgium is element number 106. It sits in period 7 (row 7) of the periodic table, in group 6 (column 6), and belongs to the d-block. Just before it comes dubnium (105), and just after it comes bohrium (107). In the same column, tungsten is above it. Elements in one column tend to behave alike.
Family: Transition metals.
Physical properties
At room temperature seaborgium is a solid.
Inside the atom
An atom of seaborgium has 106 protons in its nucleus and, when neutral, 106 electrons around it. The electrons are arranged in 7 shells: 2, 8, 18, 32, 32, 12, 2. The outermost shell holds 2 electrons. Written in full, the electron configuration is [Rn]7s2 5f14 6d4.
One mole of seaborgium weighs 269.128 grams, so a single gram contains about 2.24 × 1021 atoms.
The ring picture is a simple model that only counts the electrons in each shell. Real atoms do not look like this.
Next steps
- Work out the weight of a compound that contains seaborgium with the molar mass calculator.
- Compare it with every other element in the sortable list.
- Test yourself with the symbol quiz.
Figures on this page are from PubChem (U.S. National Library of Medicine), as downloaded on 11 November 2026. See About and data sources.